got another oso member interested in our boat we were told from Trenton Marine they believe they are 540's approx 600 hp with about 50 hours on them. we were going to take them out in put them our cig they are Strong engines and sound awesome but need to have proof of exact cubic inches before we will feel good about selling the boat. we going to do a leak down and a compression test on both motors also. but the only one that we know can only bubble upto 512 ci and is just to busy to come to the boat to have it done but then again he can only say it's over 512 CI. Talked to Kevin he has someone but that is 23 hours from us. any help would be greatly appreciated.
Thanks Ron
Here is a pic of the engines....
Help.....

For the cost of travelling 23 hours you can get a coupla gaskets and pull a head. That's the most reliable way to measure bore and stroke.

we weren't gonna take them 23 hours. we didn't want to tear the motors down we where hoping some one knew of a shop around us that had a bubble tester. that will go upto 600 ci

What's the cost of a bubble tester??? If it's not crazy expensive buy one and do it yourself .
And when done you still have the tool. I know I've bought more than one tool only to use it once and then leave it collect dust(or grease) in the tool box